<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        function Itcal() {}
        Itcal.prototype = [];  //            Itcal.prototype = Array.prototype;
        var arr = new Itcal();
            arr.push('a','b','c','d');
    </script>
</head>
<body>

</body>
</html>